/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.classfile.instruction;

import proguard.classfile.ClassConstants;

import static proguard.classfile.ClassConstants.*;
import static proguard.classfile.instruction.InstructionConstants.*;

/**
 * Utility methods for converting between representations of names and descriptions.
 *
 * @author Eric Lafortune
 */
public class InstructionUtil {
    /**
     * Returns the internal type corresponding to the given 'newarray' type.
     * 
     * @param arrayType <code>InstructionConstants.ARRAY_T_BOOLEAN</code>,
     *        <code>InstructionConstants.ARRAY_T_BYTE</code>, <code>InstructionConstants.ARRAY_T_CHAR</code>,
     *        <code>InstructionConstants.ARRAY_T_SHORT</code>, <code>InstructionConstants.ARRAY_T_INT</code>,
     *        <code>InstructionConstants.ARRAY_T_LONG</code>, <code>InstructionConstants.ARRAY_T_FLOAT</code>, or
     *        <code>InstructionConstants.ARRAY_T_DOUBLE</code>.
     * @return <code>ClassConstants.TYPE_BOOLEAN</code>, <code>ClassConstants.TYPE_BYTE</code>,
     *         <code>ClassConstants.TYPE_CHAR</code>, <code>ClassConstants.TYPE_SHORT</code>,
     *         <code>ClassConstants.TYPE_INT</code>, <code>ClassConstants.TYPE_LONG</code>,
     *         <code>ClassConstants.TYPE_FLOAT</code>, or <code>ClassConstants.TYPE_DOUBLE</code>.
     */
    public static char internalTypeFromArrayType(byte arrayType) {
        switch (arrayType) {
            case InstructionConstants.ARRAY_T_BOOLEAN:
                return ClassConstants.TYPE_BOOLEAN;
            case InstructionConstants.ARRAY_T_CHAR:
                return ClassConstants.TYPE_CHAR;
            case InstructionConstants.ARRAY_T_FLOAT:
                return ClassConstants.TYPE_FLOAT;
            case InstructionConstants.ARRAY_T_DOUBLE:
                return ClassConstants.TYPE_DOUBLE;
            case InstructionConstants.ARRAY_T_BYTE:
                return ClassConstants.TYPE_BYTE;
            case InstructionConstants.ARRAY_T_SHORT:
                return ClassConstants.TYPE_SHORT;
            case InstructionConstants.ARRAY_T_INT:
                return ClassConstants.TYPE_INT;
            case InstructionConstants.ARRAY_T_LONG:
                return ClassConstants.TYPE_LONG;
            default:
                throw new IllegalArgumentException("Unknown array type [" + arrayType + "]");
        }
    }

    /**
     * Returns the newarray type constant for the given internal primitive type.
     *
     * @param internalType a primitive type ('Z','B','I',...)
     * @return the array type constant corresponding to the given primitive type.
     * @see #internalTypeFromArrayType(byte)
     */
    public static byte arrayTypeFromInternalType(char internalType) {
        switch (internalType) {
            case TYPE_BOOLEAN:
                return ARRAY_T_BOOLEAN;
            case TYPE_BYTE:
                return ARRAY_T_BYTE;
            case TYPE_CHAR:
                return ARRAY_T_CHAR;
            case TYPE_SHORT:
                return ARRAY_T_SHORT;
            case TYPE_INT:
                return ARRAY_T_INT;
            case TYPE_LONG:
                return ARRAY_T_LONG;
            case TYPE_FLOAT:
                return ARRAY_T_FLOAT;
            case TYPE_DOUBLE:
                return ARRAY_T_DOUBLE;
            default:
                throw new IllegalArgumentException("Unknown primitive: " + internalType);
        }
    }
}
